SELECT MIN(FLOOR((CAST (GetDate() AS INTEGER) - CAST(BirthDate AS INTEGER)) / 365.25)) AS MIN
       ,MAX(FLOOR((CAST (GetDate() AS INTEGER) - CAST(BirthDate AS INTEGER)) / 365.25)) AS MAX
       ,AVG(FLOOR((CAST (GetDate() AS INTEGER) - CAST(BirthDate AS INTEGER)) / 365.25)) AS Average
       ,City
  FROM [Northwind].[dbo].[Employees]
  Group BY City
